Question about 1999 Pontiac Montana

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When Iturned off my van collant started coming out of the overflow

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You should have a coolant reservoir that the overflow hose runs to, the vehicle pulls coolant out of the reservoir as needed, as well as pushes it back in, could also be a stuck thermostat or a weak radiator cap, if you replace the cap make sure you replace it with one of the same pressure rating.

Posted on May 28, 2010

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May not be either. Does the van run hot? If it doesn't then the coolant when it is heated is going to the overflow reservoir and if that fills up then out the overflow line to the driveway or the garage floor but everything is O.K.

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While driving mt collant temp light come on.


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1 Answer

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Get a pressure tester, and test it cold. You may be burning the coolant off before it hits the ground. Could also be literally burning the coolant in the motor.

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